Carburetor



March 26, 1940. F. 0. BALL ET AL.

CARBURETORI Filed Aug. 19, 1937 INVENTOR. FREDERICK 0. BALL AND BY THO/HA6 M. BALL.

' A rfo fiqwa Patented Mar. 26, 1940 g UNITED STATES PATENT OFFICE CABBURETOR Frederick 0. Balland Thomas M. Ball, Detroit, Mich; Cornelia M. Ball, executrix ofFrederick 0. Ball, deceased, assignors to Ball and Ball Carburetor Company, a copartnership composed of Cornelia M. Ball and Thomas M. Ball Application August 19, 1937,. Serial No; 159,815 3 Claims. ((11.261-34) This invention relates to improvements in carburetors. i i More particularly the invention pertains to improvements in automatic carburetor pick-up mechanism, by which the discharge offuel from a carburetor is temporarily augmented during opening movements of the throttle valve thereof and step-up systems are carried and a cover. body portion for substantially completely enclosing such parts, which when removed, permits examination and inspection of the pick-up and nstep-up systems while the carburetor is innormal operation on an engine. 1 L

A: further object of the invention is to provide a carburetor having a body portion in whichis self-contained all. the passage and connections of ula'vacuum operable step-up system inorder to avoid the necessity of providing vacuum conducting passage in separable carburetor body parts and the. hermeticsealing together ofsuch parts i and joiningof the vacuum passage sections thereatof; Y A still further object of the invention is the provision of a substantially enclosed mechanically operable pick-up pump system which has operating parts extending through a downwardly -igopcning passage in the body structure, through which dirt and foreign matter do not readily gain access intheir normal downward travel under the action of gravity.

Other objects and advantages of the invention will be more apparent from the following description taken in connection with the accompanying drawing, in which: r Fig. l is a side elevational view, partly in section, of a carburetor embodying the invention 1 and showing portions thereof removed to disclose the underlying structure.

Fig. 2 is a vertical sectional view taken on the line 2 2 of Fig. 1.

With reference to the drawing a down-draft carburetor is provided with a body. portion 5 in which is formed a fuel mixture passage 6. A cover member 1 is detachably secured to the body portion 5 by screws 8, and .a gasket 9 is located therebetween. The cover member I is provided with a tubular part Ill which serves as an inlet to passage 6, and with a throttle body ll havingv a passage. from which fuel mixture is delivered to an intake manifold of an engine (not shown). The body portion 5 of the carburetor is provided with a fuel reservoir l2 having an inlet it which is controlled by avalve It. The valve M is operated by conventional float mechanism l5which' predetermines the fuel level in the reservoir.

Located substantially within the body portion Sis amechanically operable pick-up systemgenerally indicated at It, whichhas all its passages and connections. The mechanism l6 includes an L-shaped bar ll slidably mounted in a vertical passage ill opening at respectivelyo pposite ex tremities of the body portion 5. The bar I! is connected to apick-up piston lB slidably mounted in a bore lB by a connecting link lfi which is pivotally attached at one-extremity to-the lower endof the bar ll'and' pivotally attached at its other end to a lever l9 non-rotatably fixed on a rotatable throttle valve shaft 2|] having a throttle valve 2! thereon disposed in the outlet end por-f tion ll of the fuel mixture passage 6. The bar I! moves when the throttle valve 2! is opened; by conventional throttle valve operating apparatus generally designated at 22.

v Confined substantially entirely within the body.

portion '5 -is a step-up mechanism including all passages and connections, which is generally inv dicated at 2 3. This mechanism is adapted to vary the fuel mixture ratio in response to the degree of vacuum in a manner that is well known to those familiar'w'ith the art.

mechanism 23 includes a piston 24 adapted for reciprocatory travel in response to variations in air pressure within a bore 25 of three parallel The step-up bore'sf25, 23; and 2'! in. the body portion 5. This variation in pressure results from. variation in carburetor suction. A step-up valve mechanism 28 is located in the bore 25 for controlling the flow of liquid fuel to the fuel mixture passage 6'.

An idling tube 29 is housed within the bore 21 and, has an orifice 36 for predetermining. the supply of liquid fuel to said fuel mixture passage 6 during idling operations. has an external shank portion 3! whichslidably engages a plate 32 carried by the piston 24 and The idling tube 29 coacts with the set-up valve mechanism 28 for operatingthe mechanism 28 in accordance with changes of carburetor suction conditions.

Heretofore it has been necessary to have portions of the pick-up and step-up devices outside the body portion of the carburetor where these mechanisms were unprotected against injury, dirt and foreign matter anywhere they could not be conveniently inspected or adjusted without removing the carburetor from the enginef However, with the illustrated embodiment of our invention the pick-up and step-up devices are supported and substantially enveloped by the car buretor body portion, and a detachable carburetor cover encloses the rest of these mechanisms so that this cover may be removed while the engine bodiment of our invention, the carburetor func- "portion tions in manner well known to those familiar with the art. The cover member '1 envelopes the portion of the step-up and pick-up mechanisms not housed Within the carburetor body 5, thus protecting these mechanisms against dirt and other foreign matter which tend to settle under the action of gravity. If desired, the cover member I can be removed from the obody portion 5 by removing the screws even when the engine is running.

Withthe cover member 1 removed from the body portion 5, the upper portions of the pick-up,

step-up, and idling tube 2d mechanisms are uncovered for convenient inspection or, adjustment. After the inspection or adjustment of the pickup, step-up, and idling tube as mechanisms the cover member 1 may be reinstalled on the body portion 5 and detachablysecured by the screws 8 while the engine is in operation.

Various modifications and changes may be effected in our application without departing from the spirit of our invention or from the scope of the appended claims.

What we claim is:

i. A carburetor including a main body portion having three substantially parallel bores therein, means providing a'communicative connection between one of said bores and the fuel mixture passage of said carburetor for applying the normal suction of said carburetor to the interior thereof, a piston in said latter bore, step-up valve mechanism in another of said bores for controlling the flow of liquid fuel to said fuel mixture passage, an idling tube in the other bore having an orifice for predetermining the supply of liquid fuel to said fuel mixture passage during idling operations and having a shank-portion projecting externally of said latter bore, and a plate carried by said piston and slidably engaged on the shank portion of said idling tube and coacting with said step-up valve mechanism for operating the latter in accordance with changes of carburetor suction condition.

2. A carburetor including a main body portion having three substantially parallel bores th'erein, means providing a communicative connec ion between one of said bores and the fuel mixture passage of said carburetor for applying the normal suction of said carburetor to the interior thereof, a piston in said latter bore, step-up valve mechanism in another of said bores for controlling the flow of liquid fuel to said fuel mixture passage, an idling tube in the other bore having an orifice for predetermining the supply of liquid fuel to said fuel mixture passage during idling operations, and having a shank portion projecting externally of said latter bore, a plate carried by said piston and slidably engaged on the shank portion of said idling tube and coacting with said step-up valve mechanism for operating the latter in accordance with changes of carburetor suction condition, and a cover portion on said body portion enclosing portion of said piston, step-up valve mechanism and idling tube, said piston, step-up valve mechanism and idling tube being conveniently accessible when said cover is removed.

3. A carburet 1" including a main body portion having fuel mixture passage and having a plurality of adjacent passages therein, all extending through the upper extremity of said body portion, a fuel reservoir in said main body porticn having an open upper end at said upper extremity of said body portion, apparatus disposed in reservoir for controlling the level of fuel therein including valve and valve actuating mechanisms mounted directly on said main body portion inde endently of the remaining structure of said carburetor, an automatic step-up system disposed in certain of said plurality of passages and comprising step-up valve and valve actuating mechanisms mounted entirely directly on said main body portion independently of the remaining structure of said carburetor, a pick-up pump fuel displacing apparatus supported wholly by said main body portion including a fuel displacing member in one of said plurality of passages actuating mechanism therefor, an idling system provided in and having all portions supported directly by said body portion independently of the remaining structure of said carburetor, and a removable member for covering the upper extremity of said main body portion including cover portions for said reservoir and said plurality of passages and having an air intalre passage registerable with said fuel mixture passage, said fuel level control apparatus and said idling, step-up and pick-up systems being normally operable for inspection and adjustment when said cover member is removed.

FREDERICK 0. BALL. THOMAS M. BALL. 

